Can You make the Ball Bearings Sit at Opposite Ends of the Puzzle?
Leonardo Da Vinci ( 1452 – 1519)
He conceptualised the first helicopter, he knew that the propeller on his helicopter design would need to rotate extremely fast for lift off, and that he would have to find a solution to the friction problem. Ball Bearings, together with a lubricant would significantly reduce friction , greatly increasing the propeller’s speed.
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